The oldest stone house in Paris was built by its most famous alchemist.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

This neon landmark has been posing this deadpan question to follicly-challenged Dubliners for over 50 years.

A teddy bear sits on a chair watching the sunset from the mountaintop—just as the late Dan Clancy had done since childhood.

Ireland's most remarkable collection of these curious cone-shaped houses is worth the buzz.

Petrified footprints of one of the very first vertebrates to walk on land.

The world's toughest modern Christian pilgrimage leads directly to the gates of Hell.

The forest that inspired Winnie-the-Pooh's Hundred Acre Wood can be found outside London.

This beautiful "lagoon" is actually a toxic soup filled with cars, carcasses, and trash. When warnings couldn't stop people from going for a dip, the town dyed it black.

A local tree surgeon has created a whimsical walk full of carved tree stumps near Scotland's Loch Lomond.

A strange rock with a sinister reputation lurks within the crimson waters of this Scottish glen.

One of the largest sculpture collections in the U.K. features history's greats, from Bob Dylan to Galileo, in bronze.

Three bridges straddle a stream, one stacked upon the other.

The Metropolitan Police refurbished the blue box (perhaps not coincidentally) the same year "Doctor Who" returned to TV screens.

These ancient sunken lanes were naturally tunneled into the soft ground by countless footsteps.

A clock designed to run with perfect accuracy for 10,000 years.

The oldest public library in Ireland.

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

Dublin's "Dead Zoo" serves as a window to Victorian museum design.

An 80-year-old plane tree is devouring an iron bench at Ireland's oldest law school.

This floating garden in the sky is straight out of a fairy tale, but the real thing is nothing short of magical.

The world of the ancient Celtic civilization explained through a bewitching 11 acre garden.

The ancient tomb acts as a calendar that keeps perfect time.

A tiny microvalley etched into the side of Knocknarea Mountain hides another world.